Brake-liner fabric and process of making same.



E. B. KNOWLES. BRAKE LINER FABRIC AND PROCESS OF MAKING SAME. APPLICATION FILED JUNE 3, 1911.

1,053,299, Patented Feb. 18,1913.

EDWIN B. KNOWLES, OF BBIDGEPORT, CONNECTICUT,

ASSIGNOR TO CHESTER I: BILL,

OF LANCASTER, PENNSYLVANIA.

BRAKE-LINER FAB RIC AND PROCESS OF MAKING SAME.

To all whom, it may concern Be it known that I, EDWIN -B. KNOWLES, a citizen of the United States, residing at Bridgeport, in the county of Fairfield and State of Connecticut, have invented or discovered certain new and useful Improvements in Brake-Liner Fabrics and Processes of Making Same, of which the following is a specification. r

This invention or discovery has for its object to provide a fabric material or product, for use as a lining for machine brakes, or for other purposes, which will be of such a character that, while it will not be expensive to produce, it will afford anunusually high coefficient of friction, will be practically water-proof, and will also be of such a character as to resist the cutting or rotting effects of oil, turpentine or gasolene which might come into contact with it in use.

In the accompanying drawing Figure 1 is a broken-out enlarged transverse section of a solid woven asbestos tape suitable for use in accordance. with the present invention, and Fig. 2 isra broken-out enlarged plan view of the same, as hereinbefore referred to.

The invention is carried into effect by saturating an asbestos fabric, which may be either woven or braided, with a mixture of a fatty oil or oils, such as linseed oil, castor oil, cotton-seed oil, or the like, and a diluent, such as spirits or oil of turpentine, and to which mixture hasbeen added an amount of sulfur suitable to effect a vulcanization of the oleaginous mixture when subjected to heat. The asbestos fabric referred to will preferably be woven from #1 asbestos yarn containing only the necessary amount of cotton to enable the yarn to be properly handled in spinning and weaving, and into this yarn, or into the Woven asbestos fabric, there may also be incorporated fine wires, preferably of brass or co per, as is common in the art, to give added strength to the fabric.

In order to give a substantial body to the saturating composition above described a filler, consisting preferably of powdered litharge or white lea-d, may be incorporated into the mixture with which the asbestos fabric is to be impregnated or saturated,

, and in such case the amount of sulfur in the Specification of Letters Patent. Application filed June 8, 1911. Serial No. 631,192.

braided tape which Patented Feb. 18,1913.

mixture should be more than suflicient to vulcanize the oleaginous compound, in order that it may properly vulcanize the mixture' when containing the filler. Other such as red lead or copper oxid, etc, may be employed instead of litharge or white lead, if desired.

The asbestos fabric employed will preferably be in the form of a solid woven or may be saturated with the liquid composition above described in any suit-able manner, as by dipping or' soaking the fabric in the compound, or by pass ing the tape or a continuous web of the fabric through a tank containing the liquid composition. Also the saturated fabric may be vulcanized by subjecting the same to a proper degree of heat in any suitable manner, as is well known to those'sk-illed in the art of vulcanizing. The use of sulfur in the composition with which the asbestos fabric is saturated, and the vulcanizing UNITED STATES PATENT oFFIoE.

process referred to will give it high wearing and frictional qualities.

Referring to the accompanying drawing, which is an enlarged and somewhat diagrammatic illustration in broken-out plan and section, the warp threads 3 are properly alternated or interwoven with the weft threads 4 to forma solid woven tape with selvage edges, and incorporated with these threads 3 and 4: are fine metallic wires 5. The solid tape width, and of any desirable number of plies, a three-ply fabric being illustrated in the drawing.

- An asbestos fabric prepared in the manner above described will have great density, and While affording a high coeflicient of friction, when in use as a brake lining, or as a lining for brake shoes, it will be of such a character as to resist wear, as also to resist the cutting or rotting action of oils or other liquids which might come into contact with it, as hereinbefore stated.

I am aware that brake linings composed of asbestos fabrics saturated with various compounds have heretofore been in use, and I do not wish to be understood as claiming a prepared asbestos fabric brake lining broadly. I am also aware that brake linings comprising facings of rubber and rubber compounds have also been in use, but such rubber or fabric may be of any proper rubber compound linings are liable to the rotting or cutting effects of oils, and are moreover much more expensive to manufacture than my improved brake lining hereinbefore described.

Having thus described my invention I claim and desire to secure by Letters Patent:-

1. Aa-product or material for use as a brake' shoe lining, or the like, consisting of a solid, plural-ply tape asbestos fabric body having selvage edges and impregnated with a vulcanized oleaginous compound which includes sulfur.

2. The herein described process for producing a lining for machine brakes and the l like, consisting in saturating a solid-woven asbestos fabric with-a mixture of a fatty oil or oils, a suitable diluent, such as turpentine, and an amount of sulfur sufficient to effect awulca-nization of the mixture, and

then vulcanizing the saturated fabric by subjecting the same to the action of heat.

3. The herein described process for producing a lining for machine brakes and the In testimony whereof I afiix my signa ture, in presence of two witnesses.

EDWIN B. KNOWLES.

Witnesses:

. S. W. A'rman'ron,

. O. M. Nnvms. 

